Upgrade to spring boot 2#79

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dianw wants to merge 8 commits intomasterfrom

Commits on Oct 20, 2018

Upgrade to spring boot 2 (#65) and drop spring social (#76)
dianw
committed

Commits on May 25, 2019

Commits on Sep 13, 2019

Commits on Feb 5, 2021

Upgrade spring-boot version to 2.4.2
dianw
committed

Commits on Feb 6, 2021